Microstrip Patch Antenna Structure for Wider Radar Bandwidth
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Solution Overview
Problem
Microstrip antennas used in vehicle radar devices suffer from narrow bandwidth and beam width limitations, which hinder accurate detection of objects around the vehicle, especially for advanced autonomous driving functions like lane change assistance.
Innovation Solution
A microstrip patch antenna design incorporating a parasitic patch and via holes, where the parasitic patch is positioned to protrude outward and via holes are formed in the parasitic patch, allowing adjustment of beam width and bandwidth through variations in number, location, length, and width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional microstrip antenna is used, then the structure is simple and manufacturing is easy, but the bandwidth and beam width are narrow
Solution Approach 1:
The antenna is divided into multiple functional segments: a radiating element for signal transmission, a parasitic patch for beam shaping, and via holes for impedance control. Each segment performs a specific function that collectively achieves widened bandwidth and beam width while maintaining manageable complexity
Solution Approach 2:
The parasitic patch acts as an intermediary element between the radiating element and the surrounding environment. It mediates the electromagnetic field distribution to expand the beam width without requiring direct modification of the radiating element itself, thus achieving bandwidth enhancement with controlled structural complexity
2Measurement precision
If the microstrip antenna bandwidth is increased, then object detection accuracy improves, but the antenna structure becomes more complex
Solution Approach 1:
The parasitic patch is strategically positioned and dimensioned to create localized electromagnetic field enhancements in specific regions. This local modification of field distribution improves object detection accuracy in critical areas without requiring comprehensive restructuring of the entire antenna system
Solution Approach 2:
The via holes are designed with specific dimensions, depths, and spacing parameters that are optimized to achieve desired impedance matching and bandwidth characteristics. By carefully controlling these parameters, the antenna achieves enhanced detection accuracy while maintaining a relatively simple overall structure
3Adaptability or versatility
If the beam width is widened to detect objects over a broader range, then the antenna structure becomes more complex
Solution Approach 1:
The parasitic patch extends the antenna's effective aperture in the spatial dimension, allowing the beam to spread over a wider angular range. This dimensional extension achieves broader detection coverage without requiring multiple separate antenna elements, thus controlling structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively widens the bandwidth and beam width of the microstrip antenna, enhancing its ability to detect objects accurately over a broader range, supporting advanced autonomous driving capabilities.
Implementation Method 1
a parasitic patch spaced apart from the radiating element and disposed around the radiating element
Implementation Method 2
a plurality of radiating elements connected to one side or both sides of the power supply line and arranged in the longitudinal direction of the power supply line
Data Source
AI summary
The present invention provides a microstrip patch antenna comprising: a power supply element supplied with current from a current source, a power supply line connected to the power supply element, a plurality of radiating elements connected to one side or both sides of the power supply line and arranged in the longitudinal direction of the power supply line, and a parasitic patch spaced apart from the radiating element and disposed around the radiating element.